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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf809b4e9455f691e9a72cffc14131cc687f5a11426258c1b739fe460912430c' 
  AND token = 'uV7dDlp6UD6KXlMlfByp+Nh11BjqgXL4pobjehDtvHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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