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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bab51636066addf3c3ec0e74c5b5517a9abdb13cae3f6c15ea90b4c3c31e0970' 
  AND token = '8C4Pela38IWLBbMycudgBRDwSe3OnOl/zlicZVKf8os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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