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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c3c62cf538033b14757d88611e1b7f611dacfefb240c40c4b57a498fba3f5f6' 
  AND token = 'AOTQlkW5gSi5rCRlM9PuUZtppGESfD0TyATOSVhurFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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