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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a97beb70ce9d9fc43c80a43b1c88b841c0b44341f6db9cff525c27aff031aaad' 
  AND token = 'X+L5KhiSixgXa0v3pr1Ms1+a8ocfNZchIHpHZuOhvkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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