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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4447602c4afd1e86056002b1a5c0413f3138f147dae530620cfead23dcbc877d' 
  AND token = '6/jZWEdj/Cp9MhcZbzigAGS3utnHlB53rzg6s2DSnRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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