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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2971128ce5019ce002d28b0b41dd462893b6b1718f6ed45345c0383cea9142c' 
  AND token = 'OUWW8QxVlU2JnoeWz71QPBb9jzyLTKvZUPp2vPDfF2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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