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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5ab6c0551626a37d27f45209fb1f7552fc145cbed50de7ca71017a30c32c179' 
  AND token = 'eA3x6eOD5OV43mibdOzZSl03ZzCDM4XlVLJ96kYEpPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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