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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89fc3ff9c50b0ca622b5d9985b7d308a5faaca4cfbcd3cda8a9df877078c4976' 
  AND token = 'ui75dSVIm08cTpMf8TqTp2Z4mdGZGj3PFN9VGSNlp0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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