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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb3cc1833bb92ba80c4ef703c8bc73d26ac182df7c45ad4d99acaf3d4819b85' 
  AND token = 'ammknpVU7qDlrDn62Rj9ht7DXG4LOmpYWgm/6TEnpt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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