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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e16efbc466721ab99473721e288d7c880ef67bb4d5b882bcabdcb9dde108a7b' 
  AND token = 'CQUTjJaQAZ2+rtsuGySycYcACX+Z3VPEHm7NkKRy2V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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