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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17cddf86590ef6cd94c5c46694ab1017b4a91b2bd01a12c535cd46a684f8035e' 
  AND token = 'Ch5swUosMxq6nUeieIKSh+pGKnpyh3rgWpg7qZIpSmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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