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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7bcb5bc653852a6b0290093534b9a8e267bd6058e5d374e381da9d6900f8429' 
  AND token = 'cuuMx5CPWpCAxWzDEfBJgCiF/zkuhyeCZyVtu8GseLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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