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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d08063b09f9d9d7295508773b8b60073686663dfde6da8980a2f10f08319f2' 
  AND token = 'og0Uys+Zs/RVAiY8XiRWLDu3yMQJlY0fCHcii/odgiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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