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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a097af36021cd8af0c5e27f5a6085ef8de30f42cf202ba5a2ddb529c54b8d7' 
  AND token = '4KfvKvh7bo77QMzaIVzOXI48NGe90Vmv8UTxcxEka/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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