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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde077445525f7e482b846b4d36e9def90278685d58b8925ca07b69db609d293' 
  AND token = 'VqurmtpgI5XzT/MbFG8DZcZQWocJ0xnnZAzHbeg+8Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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