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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '125dc9eec386ddbaa8b2b770c03eb3af6cf5a7b7b145af70dfd711debef656ef' 
  AND token = '/7soBK6HioF2FpLkwYyBJXLW9z8XLfzbh/4ImU76fkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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