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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0295ac9f020030fb965283964b43842bfa63ecb3c1397dffa5e496de4b4b544' 
  AND token = 'MZ3U0OOfbrMMcMB9WtfeEVjNm8XQc+9Mipwe0K3vO9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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