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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa1d442ff580376cbbbb4f7bba93053682fa5e2ebbfa50c0d8f04770535d23e2' 
  AND token = 'BZejagDynhRr9sRVD1+fuPkgV42JRwbW4cLlX8EL1tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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