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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4be585b5e5c7c047d983881a0a18f7a7096888c74750143c79d155af6611d8d' 
  AND token = '92yTdu0DHh2ByvRDnmrF+MNbsBtaREpZQVHH0DkHmk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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