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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da9a1e0d1de5f79543cfcda39c3c4a91f8d2191f56a87811f3458b95a1d25b2a' 
  AND token = 'BrVKO0FEQO651+6osuc0r1h7HIubE7qvyuU+7EDtPzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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