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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7d94c7ca53b3ca5edc1944a1ed10ddbdf2c099338e400b04526bd9a1df84324' 
  AND token = 'D9wJXYu3rDpUPcScyGI5tdVsnw1E9r+Xsy6umAEsmw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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