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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83e0cf814d56a1088994813021de114ccf28a484080a161abe1ba8903a90597' 
  AND token = '+S5qqMgxqwNARfzQ+48v/f0co90y/KS+YIj6KJdVSJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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