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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c4179b1f67df3f205799ca8a679ad7b7e2567ad88226ed40605260293787e2' 
  AND token = 'Pk82opzcnnNiGr2ftShQ46KZELGRpSCo7KK4NqNu5mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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