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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e26dc9068d35f75234647879f8ea1c113399cd13aa058bbb61d665b1ff827741' 
  AND token = 'lUc9rb4lXKg+SrKCs+g5hYbyHs4s9VRxmOid9DsLp14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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