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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f0906e9d9c626f40704d5959ae3584d1f15aac15219e89ebcb86c420c5754fb' 
  AND token = '9PBFJ1weBbEZjvKJ5DHGcjdYoy2SiCysTPolO61vEKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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