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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c830689667a69e36c6871dba044a62c2009a6571d9ca8bb4724007e263f196c3' 
  AND token = 'Ock17qkazbWdZT2HNMBgi6CgB8G3unGLQaYs0wkfaWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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