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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dd89fa619fa27fd1e17e48a9c3fac1405bc63da1ab592351f3ea46e37fa9366' 
  AND token = 'AOjQ/YTNNnk//3MWS1vlwMT2YC/q+nXWamddul0wALA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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