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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '926697b3f46fdc7e4de7547fb27557e5e0b9bc762984ef0860492d15d128d99f' 
  AND token = 'n3G8XC0qIuGSeaonDJHHivoEwMisKEscn7NyJB8LLno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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