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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c71b673149b9aaf52312136c84ccda5e76837c6ba4c81eea976ce6a264166b' 
  AND token = 'BHy866d8ein7DKJb8wKzzu3KWVS7dzdyrBGbuM0jDGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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