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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c06504376639075d126cd06e84fff0dee60bfb02c1bd2c236844771a8289ac42' 
  AND token = 'o6wUucHoQR4P5f/tjv29V6XI+ytD59l0QJs8liClwqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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