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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b108ed027209f5176648d526d01323999c29c563ab5cdf6aacf1e91933f3a1d' 
  AND token = 'kZ9t+4RmpDjUUv/v+G66tSy0JyxkSxVl+cnI5mRGzzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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