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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30166de18413a4ba9314be61f1ea68763c8a00d1dc9729d6bfce49d7189b62a2' 
  AND token = 'YEfCKSPYG0/Y6oRYkz4w8mb6tLF4h/7Joam5fIN0/ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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