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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '731dbf3a6ea0d80aebcf672ff2f04de69c5b54a3f4b7df42b84ffdf69cd4ac19' 
  AND token = 'gP443MfPmyqn78D6xAmPQj+9vDpPFGJPrhJHOHok8w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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