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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0fe23383ec0cff860dd4fdd254835424693885efc04ddefb03b7195de41e666' 
  AND token = 'OtupZH7eNF6sJt3rWSaouySF/pGk5EhG/8nVljpYRqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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