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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fff1efa326238755d82600b166f68e8e2fec76d8f5198ff8dc4ec21f7bb9ffbf' 
  AND token = 'EX6+0UoE5yKHcscx6Q++Ny70EIc4NRepVgC0zeStwwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}