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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11847aeb2eaca3ab4a1e99fe4b98406f3c0c5dafc8e9961e4f9c137d537d5a6a' 
  AND token = 'vX+t+UfehMoJgcbXeWB8ZeyrQL1Tiysojo5cH0GUp5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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