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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b0fc73f1ae011807a594d2b2164bca54a388213b55f5ea1b8bdfb0109890b8f' 
  AND token = 'evGDxmcvaDlncgi/qdMQnGxa5zbUml+mQ7MPravPhUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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