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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e74a0ee992b62108ead652469d3454f385bff01c706a052a7f087ee4bf419c5' 
  AND token = 'vnTYsxreDyj6TpSu3lgXTUq/bDv88ucZP0NxvqO8aX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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