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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6552af9d9a490c02a3de8183db909ea854190ad5c76476c3460cf14c822a60f9' 
  AND token = '2kHE6KzNGUf+2uM5527pjNJvFNCRIAqivTewGbTQ6Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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