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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35b3044510c420db1d634e2b9294f4ebb6e96566e7068e789bcaec9cb86a2048' 
  AND token = '4tTZAs9QY2sRc/5RMWvBp7y6uf3kafjfkrQD57YfHRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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