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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e6cdb85e9c414fe05d8702c2ddfb046bfdd5d142aa3849bf8b4b510f660c3b' 
  AND token = 'LSurGUb2Oxim/HUupQTyHOU2Et0ES32gEN8V1Jpry9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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