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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf919550d1843a9d73fb357ba012ce5699364537e881adad6b75f5cced099ff3' 
  AND token = 'anCTrch6nrOK55Zmr8Snh6c21S7yJ9dJgqaubRvdqe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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