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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05003cf3d7de7b1c2f95419e09b9511083ad6dc6605b758674ceb2e0cc4c67be' 
  AND token = 'ImWYOzMa/SA8LkBxTvbXFzhyh3P5080F2JMisswDFnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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