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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39fc6ed61e94c81f19a4bec20f41cfce738e8045d06a9630f5fc2081b6b65b43' 
  AND token = 'AHe4yhY11BKwQVAVp/K9TBKJu8eX6DEcnz/3PR/adlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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