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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a5de2f88ea2b4c03625661dba9835171f9aafda1ff1717216d7bf94002ffff9' 
  AND token = 'va0bX/o7s8gK3jco21X4OpE5NuEvFlePDBK4vmumD5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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