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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bfdd783c120f9fc7c9ccf0b2d34c43f63bc471829927e404b46ef94d30a7869' 
  AND token = 'm4iud8xWNNx9OEa5UoM9CgWfzMvz4USWQel9dT+0mXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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