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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d723c806ff829f6b898b755f19a089a83c41810ed7d21268fd1ad4e76903f20' 
  AND token = 'maGa1zIlGDMpEoGOIu8m9P5yl787ZW6av5RbhVXbKOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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