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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c77f223b34afb0733e95d6dbc1adcf35d54f14799fb09478641a0ef07f292958' 
  AND token = 'P1FKjpszzvQBRwbnQL1qt9sqKreBY40Y9nanm97Hx4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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