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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2d8a25a8559a9a56bbfc5c0623582cc8d840caa0ed3ed8150534ea90cb52f5' 
  AND token = '7lINcx2gVipc0e0LeA1qtfRie+0kNctYkixPJCOHKGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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