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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de8aa37ebe0bf76762875a16849fab7449d6e3498119ef6c1786759d9c90584d' 
  AND token = 'YgC6IPMPp9Vwd3om7h0mkmBKNnKwrup6Pg8nUBrIEps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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