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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e298bd48fe8de9be8a6d9475d22ea44529157642bd0f3ab9a4e2ca539df5e744' 
  AND token = 'qgV9Lu9Kr5crj3zt3c/VobfdoJZGqAq/6AsU11uu6c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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