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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f19b6bb0afa4b16cec1080c8d0c49bf1ca400cb87d62062b3ea6090115da69d' 
  AND token = 'T6JIqSdyIes+UdJtEY0tH0ck3bIU4jjIGofmNGeFlRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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