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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ff1e95a6a48f980c83104c6a26725278606baa6f23e61e71d05c187108aaf03' 
  AND token = '2mEszspc83q5Gzi7GGsZqIspRZZYG/f83vL5iQ++adk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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