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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '516a2fe7f69df2c669ec0431b0a514f1696813f83b5f7375de3e0bf88f901926' 
  AND token = 'gEGKKFKRN354wD5tfAXurmWTU/Dar6pBHvkWMFK9ZkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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