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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03eb0c7b8bff30912cc7d52ab5b5efc62f0e01ef37fdd925899b4af3fff00b64' 
  AND token = 'gp5KDquMhT+aDJ7MPSoK8r2G+QRTOH/tptXmasxtdLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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