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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02bfa8824993062272a07388ac73eb86758db6f78cac1b518985d8117162b03d' 
  AND token = 'peRmGg6vpNsFGQspn33jDcPAcSxs8aaSJwPxFzpAOsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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