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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3f74cc1d1060f7f473f06f5288d8b2c3c3cefa44ba19fb24c3b9c0e1f26a3cf' 
  AND token = 'SHi1iSvJY8SJxhi8kdziiMcqxgrmV1DgQZ4ArfzYGis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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