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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdbd58274c85ae1af83de365762054309d4cb917271b5fabebf4a1348558b0a4' 
  AND token = 'PAmKN+VO6lGLS1x8Pyej/nFlP3hDVdejFT9lTPwZrAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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