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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30886fd43e546f4bdb7c451b3ad2c3691b7ce396c51d6fae204468087c74c5f3' 
  AND token = '2Zw7VcAgbFx0svEi7/s9I6Yl3/mVmdZr62BmqLR33mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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